If Every Participating Firm Has the Same Marginal Benefit from Industrywide

If every participating firm has the same marginal benefit from industrywide advertising, then ________.

A) requiring every firm to pay the same amount for advertising is not likely to create dissatisfaction amount the firms
B) every firm should be required to pay nothing for the advertising
C) requiring every firm to pay different amounts for advertising is not likely to create dissatisfaction amount the firms
D) requiring every firm to pay the same amount for advertising is likely to create dissatisfaction amount the firms